I'm coming to Philly from NYC on Nov. 18th to run the Marathon on the 19th and looking for a decent pasta dinner (nothing too fancy or complicated) for my pre-race carbo load.
I'm staying near the race start which is right by the Art Museum so optimally I would love to be able to walk there.
I'd go to Pietro's on Walnut between 17th and 18th. Great pasta, pizza, and salads ... nothing too crazy to upset your stomach. Plus, prices are very reasonable. It would be a long walk - doable, but with the race you'd probably want to cab. I don't think there is much in the Art Museum area that would fit your needs ...
None of the places recommended are near the art museum. There are a few restaurants in the area that serve pasta but none that specialize in it.
Little Petes on Fairmount between 24th and 25th has many pasta dishes. It is a diner with ok food, big portions and very inexpensive.
Bridgids on 25th as a few pasta dishes. They are all under $15.
I would not normally recommend either places for chowish dining but they probably have exactly what you need.
Long's asian at 21st and Hamilton has a number of noodle dishes all are very good.